α-decays of neutron-deficient americium isotopes

M. Sakama, M. Asai, K. Tsukada, S. Ichikawa, I. Nishinaka, Y. Nagame, H. Haba, S. Goto, M. Shibata, K. Kawade, Y. Kojima, Y. Oura, M. Ebihara, H. Nakahara

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Abstract

Neutron-deficient americium isotopes 233,234,235,236Am were produced in the bombardment of multiple thin targets of 233U and 235U with 7.6-10.5 MeV/nucleon 6Li ions. The reaction products were effectively mass-separated using the on-line isotope separator (JAERI-ISOL) coupled to a helium gas-jet transport system. For the first time, the α transition of 235Am was observed, and some improved α-decay data for 233,234,236Am and229Np (α-decay daughter of 233Am) were accumulated. The α-particle energies of 233Am and 235Am were determined to be 6780±17 keV and 6457±14 keV and their half-lives were 3.2±0.8 min and 10.3±0.6 min, respectively. Measured α-decay branching ratios of 235Am and 229Np were (4.0±0.5) × 10-3 and 0.68±0.11, respectively, while the lower limit for α-decay of 233Am was deduced to be 3 × 10-2. Hindrance factors and probable assignments of the levels involved in those α transitions are discussed.

Original languageEnglish
Article number014308
Pages (from-to)143081-1430811
Number of pages1287731
JournalPhysical Review C - Nuclear Physics
Volume69
Issue number1
Publication statusPublished - 2004 Jan

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Sakama, M., Asai, M., Tsukada, K., Ichikawa, S., Nishinaka, I., Nagame, Y., Haba, H., Goto, S., Shibata, M., Kawade, K., Kojima, Y., Oura, Y., Ebihara, M., & Nakahara, H. (2004). α-decays of neutron-deficient americium isotopes. Physical Review C - Nuclear Physics, 69(1), 143081-1430811. [014308].